Ball mill liner



J. R. BALL.

BALL MILL LINER. APPLICATION FILED SEPT-19. 1918.

Patented June 24, 1919.

3 SHEETS-SHEET 1 1 J. R. BALL.

BALL MILL LINER.

APPLICATION FILED SEPT-19. 191s.

Patented June 24, 1919.

3 SHEETSSHEET 3.

511mm toz (906w 532% wane Jo JOHN R. BALL, OF DURAN G0, COLORADC BALL-MILL LINER.

Specification of Letters Patent. Patented J 1 9 24, 1919,

Application filed September 19, 1918. Serial No. 254,783.

To all whom it may concern:

Be it known that l, JOHN R. BALL, a citirango, in the county of La Plata and State of Colorado, have invented certain new and useful Improvements in Ball-Mill Liners; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to the class of mills used principally for grinding ore to a predetermined mesh and employing a rotary grinding chamber in which a'plurality of crushing balls are provided. Heretofore, considerable difficulty has beenencountered with the common types of linings employed for such mills and since it is often necessary to remove an old lining and install a new one, it has been a source of great trouble.

It is therefore the obj ect! of my invention to provide a novel type of lining for ball mills which is free of a number of objections heretofore existing.

With the foregoing obj eet in view, the in-' vention resides in the novel features of con structlon and unlque association of parts.

hereinafter fully described and claimed, and illustrated in the accompanying drawings. -Figure 1 is a vertical longitudinal section of a ball mill provided with the improved lining. I

Fig. 2 is a vertical transverse section on the plane of the line 2--2 of Fig. 1.

Fig. 3 is a side elevation of. one of the segments of the end lining' Fig. 4 is an elevation of one of the lining rings against which the segments of the end lining abut.

Fig. 5 is a detail section showing the bolt and washers used in securing the end linings in place. j Fig. 6 is a view similar to Fig. 2 but illustrating a difi'erent form of construction.

Fig. 7 is a vertical section on the plane indicated by the line 7 -7 of Fig. 6.

The "construction shown in Figs. 1 to 5 will first be described. To this end, the numeral .1 designates a. grinding cylinder preferably of two part construction bolted together at 2, the endsof said cylinder being provided with tubular trunnions 3 and 4, the

ormer having a spiral collecting head 5 for feeding the material to be ground into said trunnion, while the trunnion 4 is provided with a discharge head 6, it beingthrou-gh said last named trunnion that the ground material is discharged from the mill. Suitable bearings 7 are employed for the trun' nions 3 and 4. and the cylinder 1 may be rotated by any preferred means such as the chain 8 driven from the counter shaft 9 which may in turn be rotated by any preferred means. A belt pulley 10 is shown for this purpose.

The lining for the peripheral wall of the grinding chamber 1 consists: of a plurality of arcuate plates 11 disposed edge to edge and extending from oneend of the cylinder to the other end, thereof. One edge of each lining plate 11 is provided in one offits outer corners with a groove 12 while t e other edge of the plate is equipped on the corresponding corner with a tongue 13,-the several tongues bein received in the grooves of the adjacent p ates as shown clearly in Fig. 2. The grooved edges of the plates 11 are provided with ribs 14 extendingthroughout the length of said plates and projectlng in grinding the ore or the like. No bolts whatever or other fastening means are passed through the lining plates 11, this being a decided advantage over certain-other forms of linings commonly secured by bolts. Bolts are required however for securing they end linings in place, but these linings are made I to perform not only their usual functions, but in addition are disposed to secure the lining plates '11 in place andto rumferential creeping I thereof.

Each end lining consists of acenter lining ring 15 secured to the cylinder end by preyent cirbolts 16', and a plura'lity of segmental plates 17resting against the peripheral edge of the ring 15, the peripheral edges ofsaid plates 17 bearing against the inner sides of the lining plates 11 to retain, them against thecylinder wall and being provided with notches 18' forming seats which receive the ribs 14,

thus holding the 'platesdl against circum ferential creeping. Bolts 19 are provided to securethe plates 17 to the ends of thecylinder and the heads of these bolts, as well as those of. the bolts 16, areby preference "countersunk "as shown in Fig. 2. Between the nuts 20' of the several bolts 16 and 19 and the cylinder ends, flat washers 21 and cone washers 22 are preferably employed as detailed Fig.5, said. cone washers, tightly ings23 which may be removed and replaced when required, the inner ends of said linings abutting the rings 15, while the outer ends thereof bear against the heads 5 and 6. By this arrangement, the linings 23 are held against both inward and outward shifting,

yet by removing the heads, said linings may be easily withdrawn when required to permit new onesto be substituted. It will also be clear that the lining of the cylinder 1 may be removed, repaired, replaced, etc,

with ease and in a comparatively short time, it being important that no means other than the end'linings are provided for securing the lining plates 11 in place and for preventing cree ing thereof, since this not only permits quic removal and replacing of said plates 1 11, but leaves the wall of the grinding cylinder free of cracks and the like through which. the powdered materialmaysift. j

The form of the invention'shown in -Figs.

6 and 7 is slightly different from that illus trated in the other views, inthat the lining sections 11 are not tongued and grooved together, and the arrangement of the seats 18 is slightly different. Also, an annular rib 24 is preferably formed on each. cylinder end to abut the segmental plates 17- and' the rings 15 as shown.

- From the drawings I have shown and in the foregoing described two forms of my invention which have proven to be commercial successes, but I wish it understood that I am not restricted to the exact details shown and described, as will appear from an analysis of the inventlon as claimed.

I claim 2 1. In a ball mill, the combination with a,

rotary cylinder having a grinding chamber therein; of an internally ribbed lining lying fiat against and unsecured to the peripheral wall ofsaid chamber, other linings for the ends of said chamber lying flat against said ends and having peripheral notches receiving the ribs of. said wall lining to prevent circumferential creeping of the latter, and means securing said end linings to the ends of said chamber, said end linings being the sole securing means for said ribbed wall lining.

2. In a ball mill, the combination With a rotary .cylinder having a grinding chamber therein; of a lining for the peripheral Wall of said chamber unsecured thereto and composed of plates lying flat against said wall in abutting edge to edge relation and extending from one to the other of the end walls of said chamber, said plates having ribs on one edge transverse to the direction of rotation of the cylinder, and overlapping the other edges of adjacent plates, end linings for the ends of said chamber formed of segmental plates whose peripheral edges bear against the inner sides of said peripheral lining to secure it in place, said end lining plates having notches in their edges receiving said ribs to hold said peripheral lining against circumferential creeping, and means securing said segmental plates flat against the ends of the grinding chamber, said end linings being the sole securing means of said wall lining.

In testimony whereofI have hereunto set my hand.

JOHN R. BALL. 

